Update CMake configuration to add a dependency on Abseil #10401
Merged
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This is the most recent Abseil LTS branch, from November 2021. We do not yet use Abseil for anything, but this change will make it possible to start using it in CMake when we're ready. This PR was tested by confirming that using absl::string_view from protobuf::Message doesn't break anything (under CMake builds only).
Note: this is a roll-forward of #9793 after we've put more CMake test coverage in place.